Mini portable charger w/retractable USB cable
 

It's roughly 2x1.5 inches so very pocket friendly.

http://www.frys.com/product/5726952?...H:MAIN_RSLT_PG

Re: Mini portable charger w/retractable USB cable
 

I looked up the power rating.......650mah? Carrying a second battery is smaller and provides more than that =P

I saw something at Home Depot for $19.95 where it would provide about 80 hours of of playback use. Am had multiple tips for other devices.

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Re: Mini portable charger w/retractable USB cable
 

Compare the power rating, not the promises of x amount of hours of whatever activity since the usage is different for everyone.....i've seen too many people rate these things badly cuz the box says x amount of hours and they don't get that amount because they have everything on full blast the whole time expecting a tiny battery that might not be higher capacity than the one in their phone to perform miracles.